IsRectEmpty function (winuser.h)

Article
02/22/2024

The IsRectEmpty function determines whether the specified rectangle is empty. An empty rectangle is one that has no area; that is, the coordinate of the right side is less than or equal to the coordinate of the left side, or the coordinate of the bottom side is less than or equal to the coordinate of the top side.

Syntax

BOOL IsRectEmpty(
  [in] const RECT *lprc
);

Parameters

[in] lprc

Pointer to a RECT structure that contains the logical coordinates of the rectangle.

Return value

If the rectangle is empty, the return value is nonzero.

If the rectangle is not empty, the return value is zero.

Remarks

Because applications can use rectangles for different purposes, the rectangle functions do not use an explicit unit of measure. Instead, all rectangle coordinates and dimensions are given in signed, logical values. The mapping mode and the function in which the rectangle is used determine the units of measure.

Examples

For an example, see Using Rectangles.

Requirements

Requirement	Value
Minimum supported client	Windows 2000 Professional [desktop apps only]
Minimum supported server	Windows 2000 Server [desktop apps only]
Target Platform	Windows
Header	winuser.h (include Windows.h)
Library	User32.lib
DLL	User32.dll